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  2. Beta-sandwich - Wikipedia

    en.wikipedia.org/wiki/Beta-sandwich

    Beta-sandwich or β-sandwich domains consisting of 80 to 350 amino acids occur commonly in proteins. They are characterized by two opposing antiparallel beta sheets (β-sheets). [ 1 ] The number of strands found in such domains may differ from one protein to another. β-sandwich domains are subdivided in a variety of different folds.

  3. Comparison of video codecs - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_video_codecs

    The quality the codec can achieve is heavily based on the compression format the codec uses. A codec is not a format, and there may be multiple codecs that implement the same compression specification – for example, MPEG-1 codecs typically do not achieve quality/size ratio comparable to codecs that implement the more modern H.264 specification.

  4. List of open-source codecs - Wikipedia

    en.wikipedia.org/wiki/List_of_open-source_codecs

    This is a listing of open-source codecs—that is, open-source software implementations of audio or video coding formats, audio codecs and video codecs respectively. Many of the codecs listed implement media formats that are restricted by patents and are hence not open formats.

  5. Jelly roll fold - Wikipedia

    en.wikipedia.org/wiki/Jelly_roll_fold

    The fold is an elaboration on the Greek key motif and is sometimes considered a form of beta barrel. It is very common in viral proteins , particularly viral capsid proteins. [ 3 ] [ 4 ] Taken together, the jelly roll and Greek key structures comprise around 30% of the all-beta proteins annotated in the Structural Classification of Proteins ...

  6. B3/B4 tRNA-binding domain - Wikipedia

    en.wikipedia.org/wiki/B3/B4_tRNA-binding_domain

    This domain has a 3-layer structure, and contains a beta-sandwich fold of unusual topology, and contains a putative tRNA-binding structural motif. [2] In Thermus thermophilus, both the catalytic alpha- and the non-catalytic beta-subunits comprise the characteristic fold of the class II active-site domains.

  7. Beta barrel - Wikipedia

    en.wikipedia.org/wiki/Beta_barrel

    In protein structures, a beta barrel (β barrel) is a beta sheet (β sheet) composed of tandem repeats that twists and coils to form a closed toroidal structure in which the first strand is bonded to the last strand (hydrogen bond). Beta-strands in many beta-barrels are arranged in an antiparallel fashion.

  8. Rossmann fold - Wikipedia

    en.wikipedia.org/wiki/Rossmann_fold

    The Rossmann fold is a tertiary fold found in proteins that bind nucleotides, such as enzyme cofactors FAD, NAD +, and NADP +.This fold is composed of alternating beta strands and alpha helical segments where the beta strands are hydrogen bonded to each other forming an extended beta sheet and the alpha helices surround both faces of the sheet to produce a three-layered sandwich.

  9. PKD domain - Wikipedia

    en.wikipedia.org/wiki/PKD_domain

    PKD (Polycystic Kidney Disease) domain was first identified in the polycystic kidney disease protein, polycystin-1 (PKD1 gene), and contains an Ig-like fold consisting of a beta-sandwich of seven strands in two sheets with a Greek key topology, although some members have additional strands. [1]